iFixit - Answers With Device "Test Equipment"

iFixit Digital Multimeter: xmas light buld testing

Wed, 11 Mar 2026 16:33:18 -0700

Can the meter be used to test for a bad xmas light in a string of lights?

⟐ Answered March 11, 2026 at 16:33 MST

Tekpower TP3005T Variable Linear DC Power Supply: In dc power supply voltage is showing 0 value..how to fix it

Thu, 05 Feb 2026 22:33:41 -0700

On display it is showing 0 voltage value ...value is not moving ...i think there is problem in motherboard..how to find the problem

⟐ Answered February 05, 2026 at 22:33 MST

Multimeter: Is there anything materially different about this 115?

Fri, 23 Jan 2026 12:19:42 -0700

For context, this is listed as a FLUKE-115/LT meter. I also noticed the UPC and model is different from the retail version (Retail SKU: 095969324182/FLUKE-115). For example when I lokup the retail 115 UPC, this is what I see: https://www.barcodelookup.com/0959693241...

Now, likewise, when I search for this 115/LT, this is what I get: Barcode Doesn't Exist in Our Database

As best I can tell, this is likely a standard 115, branded by the school as a theft deterrent, purchased in bulk. It's that or they were supplied as part of the tuition or school surplus. I know if it is surplus, it is probably due for calibration because some red tape says it has to be done, but due to the cost of the "student meters" they replace them and surplus the old ones out.

Based on everything I see here, there's no difference from my retail 115 - it's just gently used as a classroom meter, OR it was briefly used by a student who left the trade/upgraded.

@danj here's what the leads look like - same as a retail 115:

⟐ Answer accepted January 23, 2026 at 12:19 MST

Multimeter: Meter displays OL in voltage continuity mode with or without probes?

Mon, 19 Jan 2026 09:56:38 -0700

Quite an expensive Voltmeter device , did this from day one

OL means ‘over load’ but it isn’t even connected to anything

i suspect it is faulty but wanted to find out if anyone else has experienced this and maybe it’s simple

⟐ Commented January 19, 2026 at 9:56 MST

Multimeter: Multimeter continuous beeping in continuity mode

Sun, 04 Jan 2026 08:12:24 -0700

continuous beeping even with test leads removed.

checked battery and opened it up with no showing of corrosion or something shorting anything. Fuse still intact also did not work with high voltages.

Was checking some dead phone batteries at the time and when got back to it it kept beeping.

does not want to work in any other mode at all.

⟐ Commented January 04, 2026 at 8:12 MST

UK-830LN: Black lead has shorted how do I fix lead

Sun, 14 Dec 2025 20:14:59 -0700

Black lead has shorted how do I fix lead

⟐ Answered December 14, 2025 at 20:14 MST

Klein TI270: Replacement LCD Options For Klein TI270 Infrared Camera

Sun, 16 Nov 2025 17:17:38 -0700

Needs some suggestions for finding a replacement LCD. It's a 45pin 3.5" 320x480 TFT LCD. Can't seem to find anything remotely close and customer service wants nothing to do with it. Seem like a waste for a $400 camera since it's just a simple LCD. Looks like the unit runs off a ARM STM32h750.

⟐ Commented November 16, 2025 at 17:17 MST

ZOYI ZT-703S: Multimeter function is not working

Thu, 18 Sep 2025 12:01:31 -0700

Hello. I have a ZT-703S with a problem: the oscilloscope function works fine, all buttons work, and it takes measurements normally. However, when I switch to the multimeter function, only a few windows appear, including the analog scale, but no numbers appear. It no longer responds to functions like diode, resistance, and voltage. I updated the firmware and reset the settings to factory settings, but it still hasn't returned to normal. Does anyone know how to fix this?

⟐ Answered September 18, 2025 at 12:01 MST

Digital and MSO Oscilloscope: MSO9104A Oscillscope faulty need rerpair

Mon, 01 Sep 2025 02:29:27 -0700

i have a set which shows error FPGA mismatch

MEMCON 2 error
MEMCON 3 error after checking manual , its say its acquisition board faulty.

i managed to purcvhase a working set and then replace it with a acquisition board ... it was working for one but then it become blank screen. then it keep re booting.

MCH-108 Digital Multimeter: Is the continuity test suitable for sweeping IC pins?

Mon, 09 Jun 2025 10:54:47 -0700

Looking to buy my first multimeter. I have access to an old RadioShack multimeter that struggles with continuity, often taking a full second or more before beeping when the probes are shorted. I am looking for a multimeter for home projects and small repairs/tinkering so accuracy isn't necessarily my top concern, but responsiveness is as it will help reduce uncertainty and be more enjoyable to use.

If I quickly drag the probe across IC pins, will it:
A. Beep if a single pin is shorted to the other probe (not likely to miss a short)
B. Be reasonably noticeable to the average person. (loud beep on quick short)

I don't need it to be latching, just reasonably usable for this use case. I have used multimeters very briefly and am basically completely new to the hobby.

Multimeter: Multimeter won't stay powered up

Fri, 06 Jun 2025 11:50:48 -0700

Micronta 22-167 multimeter lcd sreen illuminates momentaritly and then fades out when press and release the "power" button

⟐ Answered June 06, 2025 at 11:50 MST

MCH-108 Digital Multimeter: Does this include the multimeter testing leads?

Wed, 28 May 2025 20:49:11 -0700

Does this include the multimeter testing leads?

⟐ Answer accepted May 28, 2025 at 20:49 MST

Fluke 77 Series III: Could somone please do a repair tutorial on the continuity buzzer

Wed, 28 May 2025 18:25:42 -0700

My Fluke doesnt beep when i measure for continutiy but unfortunatly i dont know where to start with the troubleshooting. Regards, Thomas

⟐ Answer accepted May 28, 2025 at 18:25 MST

Varo Digital Multimeter: The buzzer doesnt work

Wed, 14 May 2025 11:00:27 -0700

The buzzer does not work

RadioShack 22-510 Switching Power Supply: Getting hash from 22-510

Sat, 10 May 2025 16:08:40 -0700

My Radio Shack 22-510 power supply is generating hash in my receiver. Need solution.

⟐ Answer edited May 10, 2025 at 16:08 MST

Multimeter: minipa ET-2033B multimeter, turns on but doesn't measure anything

Wed, 30 Apr 2025 17:56:10 -0700

Does anyone have the ET-2033B schematic?

⟐ Commented April 30, 2025 at 17:56 MST

Fnirsi FNB58: Is there an audio device inside to make sounds on button presses?

Mon, 14 Apr 2025 08:27:02 -0700

I recently got an FNB58 and have been exploring its capabilities. In the settings for the device there is an on/off control for button press sounds. I haven't been able to get this to work so I was wondering if there is actually a sound capability in the FNB58. From the teardown pictures I don't see anything that looks like a speaker. Is there actually one inside that I'm not seeing?

Multimeter: Why is my not reading voltage

Tue, 11 Feb 2025 16:58:10 -0700

Why does my Klein multi meter not reading voltage?

⟐ Commented February 11, 2025 at 16:58 MST

Power Supply: APW7-12-1800 12V Power supply for Antminer ASIC Machine

Mon, 10 Feb 2025 11:42:58 -0700

Hello! I have a Power supply for antminer Bitcoin mining ASIC. model apw7-12-1800. Made by Shenzhen Century Cloud Core Technology, Ltd. Model subtype A3, Looking for repair information. any help? Thanks! Dave

⟐ Commented February 10, 2025 at 11:42 MST

Fluke VoltAlert: Fluke VoltAlert green button replacement.

Thu, 06 Feb 2025 10:04:56 -0700

While i was taking the pcb from my tester i slipped up and somehow my screwdriver went out of the hole and in my finger. Anyways does anyone know a replacement for this green button because mine is broken into pieces. I taught about using eraser of a pencil but is was too big. Any ideas? Or should i buy a new one all togheter? Everyting works fine tho just the rubber button is broken.

⟐ Commented February 06, 2025 at 10:04 MST